feat: i18n for sign page in mastodon

components/user/UserSignIn.vue

@@ -12,6 +12,7 @@ let autocompleteIndex = $ref(0)
 let autocompleteShow = $ref(false)
 
 const users = useUsers()
+const userSettings = useUserSettings()
 
 async function oauth() {
   if (busy)
@@ -32,6 +33,7 @@ async function oauth() {
       body: {
         force_login: users.value.some(u => u.server === server),
         origin: location.origin,
+        lang: userSettings.value.language,
       },
     })
   }

server/api/[server]/login.ts

@@ -4,7 +4,7 @@ import { getApp, getRedirectURI } from '~/server/shared'
 
 export default defineEventHandler(async (event) => {
   let { server } = getRouterParams(event)
-  const { origin, force_login } = await readBody(event)
+  const { origin, force_login, lang } = await readBody(event)
   server = server.toLocaleLowerCase().trim()
   const app = await getApp(origin, server)
 
@@ -21,6 +21,7 @@ export default defineEventHandler(async (event) => {
     scope: 'read write follow push',
     redirect_uri: getRedirectURI(origin, server),
     response_type: 'code',
+    lang,
   })
 
   return `https://${server}/oauth/authorize?${query}`